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Neko [114]
2 years ago
5

5 What is the concentration of a 25.0 mL HCl solution containing a phenolphthalein indicator that is titrated with 0.1 M NaOH if

it requires 34.2 mL before the solution turns pink?
0.0578 M


1.37 M


0.137 M


0.274 M
Chemistry
2 answers:
storchak [24]2 years ago
8 0

Answer:

The correct answer is 0.137 M, just did in and got it correct ;)))

Explanation:

Neporo4naja [7]2 years ago
4 0
The correct answer is 0.137 M.

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<span>Mass of nitrogen = 14.0067
</span> Mass of oxygen = 15.9994
In this compound nitrogen = 36.86 / 14.0067 = 2.63 
<span>And oxygen = 63.14 / 15.9994 = 3.95 <span>
now we have: N----- 2.63 and O----3.95 
by dividing both with the smallest number we get
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<span>O-------3.95/2.63 = 1.5
To get whole numbers we multiply both by 2
</span></span></span> N= 1 x 2 = 2 And O = 1.5 x 2= 3
<span>So, the empirical formula is N</span>₂O₃.
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